A block of mass 20 kg kept on a rough
horizontal surface can be maintained in
uniform motion in a straight line when a force
of 100 N is applied to the body in the direction
of its motion. Find coefficient of kinetic friction
between the surfaces.
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Answer:
12 N.
Explanation:
Given :
Mass of block = 20 kg
Force = 12 Newton
Coefficient of the friction = 0.1
Find the maximum possible frictional force :-
f _{maxs} = \mu_s \: \\ R \: = \mu_s \\ \\ mg = 0.1 \times 20 \times 9.8 = 19.6 \: N
Since,
The applied force is 12 N
(which is less than 19.6 N)
Therefore,
The frictional force will be 12 N.
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